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I’m selling my Skimz SM 161 internal protein skimmer. It is meant for tanks up to 250 gallons (light bio load) and down to 120 gallons (heavy bio load). I recently took down my tank but had worked great for over a year up until then. I purchased it a couple years ago for $399.95 I believe. The only alteration I made was to enlarge one of the holes in the collection cup lid so I could fit a float switch in it for use with a co2 scrubber. Looking for $220 for it now. All parts and pieces are still there. Works perfectly. Collects tons of foam.